An online math tutor service would like to claim that the average time spent taking a standardized test after students go through tutoring is less than the average time spent before going through tutoring. A simple random sample of students takes a pre-test, then goes through tutoring and takes a post-test. Results of the sample are shown below. Before After What are the population parameters? Mean 82.333 74.944 Variance 110.118 199.820 Pick Observations 18 18 Pearson Correlation 0.727 Hypothesized Mean Difference Is the two-sample hypothesis test a paired t-test or an unpaired t-test? df 17 t Stat -3.227 Pick P(Tet) one-tail t Critical one-tail P(Tct) two-tail t Critical two-tail Confidence Level 0.002 -1.740 0.005 What is the level of significance? Ex: 0.12 -2.110 99% What is the null hypothesis Ho ? Pick What is the alternative hypothesis H,? Pick Should Ho be rejected or does Ho fail to be rejected? Pick What conclusion can be drawn from the data? Pick v evidence exists to support the claim that the mean time spent taking a test after tutoring is less than the mean time spent taking a test before tutoring. 21

Q: Healthy females have a mean red blood cell count of 4.8 million cells per microliter of whole blood ...

A:

Q: Which of these responses is false about adjustment by stratification? A. It is carried out only for...

A: Option A is not true. Adjustment is only carried out only for the one independent variable and an ou...

Q: For the given set of data: (98, 56, 59, 56, 73, 67, 67, 67, 70, 64} Determine: (a) Mean (b) Median (...

A: Given data is 98,56,59,56,73,67,67,67,70,64Arrange the data in ascending order56,56,59,64,67,67,67,7...

Q: please answer d) and e)

A: Poisson distribution is used to estimate the discrete random variable observation that happen with i...

Q: In the calculation of the moment of the force about the axis, the cross-product table (i.e., the 3 X...

A: Moment of the force about the axis 3*3  matrix( cross product table) used

Q: Suppose X - N (-9,4). Between what a values does 95.48% of the data lie? The range of a values is ce...

A:

Q: A survey of 44 people was conducted to compare their self-reported height to their actual height. Th...

A: Given that  the mean difference is greater than 0.9.  the mean difference was 1.25, with a standard ...

Q: Why do you think that our customer-centric approach to valuation is often called the eyeball approac...

A: Customer centric approach is called the eyeball approach because Customer experience seems obvious, ...

Q: The figure to the right shows the results of a survey in which 1018 adults from Country A 1015 aduit...

A: Given Information: Country Sample size (n) Sample proportion (p^) A 1018 0.37 B 1015 0.19 C...

Q: In finance, one example of a derivative is a financial asset whose value is determined (derived) fro...

A:

Q: Let X, Y ~ U[a, b] be independent. Define Z = max{X, Y}. Find the cdf of Z.

A: Let X, Y ~ U[a, b] be independent.

Q: Suppose that Y,...,Y, Poisson(A). We have shown that the MLE for A is Y. It turns out that we are of...

A: find the mle..........

Q: The compressive strength of concrete is being studied, and four different mixing techniques are bein...

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 23 for the population o...

A: Given information- Population standard deviation, σ = 23 Confidence interval = 0.95 Significance lev...

Q: The scores on a college entrance exam have an approximate normal distribution with mean,  μ=68  poin...

A:

Q: X P(X) X · P(X) (х — и)2 (X – µ)² · P(X) 0.05 10 0.34 15 0.26 20 0.25 25 0.10

A:

Q: Transistor gain is an integrated circuit device between emitter and collector (hFE) is related to tw...

A: Multiple linear Regression Line (a)(i)

Q: What is the p-value if, in a two-tail hypothesis test, ZSTAT = + 1.96? Click here to view page 1 of ...

A:

Q: Which of the following conclusions is not supported by this diagram? a) There are currently several ...

A: None of the option is supported by the diagram. 

Q: A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspape...

A: Given7,7,10,8,6,9,9,9,11,6,7,6,9,7,9sample size(n)=15

Q: At a summer tea party in Cambridge, England, a lady states that tea poured into milk tastes differen...

A: Given       Here,  Grand total Frequency.                

Q: Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 5 per hou...

A: This is poisson process........

Q: In any data set, what percent of data lies within 8 standard deviations of the mean a. 98.44% b. 9...

A: Solution-: We find the what percent of data lies within 8 standard deviations of the mean (a) 98.44%...

Q: In the past, 32% of a country club's members brought guests to play golf sometime during the year. L...

A: Formula : Test statistic

Q: Theorem 7-6. If the variables are uniformly bounded then the condition, lim Bn = 0, n- 00 n2 is nece...

A:

Q: 1 3. 6. 8. 9. 140 A sample of a radioactive material is studied in a lab. There are 1372 gamma ray e...

A: Given that, There are 1372 gamma-ray emissions in 245 seconds. So, the number of gamma-ray emissions...

Q: a.The probability of selecting 3 customers in a row who were not compensated and were not satisfied....

A:

Q: Using the partially completed analysis of variance and table of means provided below, answer the fol...

A: Given: Source SS df MS F Treatment       3.9302 Error     9.03   Total ...

Q: A study showed that the sex ratio of children born to families in a native community of Ontario devi...

A: A study showed that the sex ratio of children born to families . Given: A news paper report about th...

Q: 3. Pranshu shared a funny Tik Tok with three of his friends. His three friends shared it with three ...

A: Tree Diagram A tree diagram is very useful to represent multi-stage events for displaying the outcom...

Q: The coefficient of determination for the average low temperature (x) and the average monthly electri...

A: Given: Coefficient of determination r2=0.92

Q: Calculate the first four moments of the following data about the mean and have find B, B, & 2: X: 2 ...

A:

Q: The probabilities of the outcomes of rolling a loaded (unfair) 6-sided die are as follows: P(1)=0.1...

A: We know that  If the dice is rolled then the sample space.  S={1,2,3,4,5,6} NOTE:- According to bart...

Q: You wish to test the following claim (HaHa) at a significance level of α=0.001α=0.001. Ho:μ...

A: Hypothesis testing : Hypothesis testing could be a form of applied mathematics reasoning that involv...

Q: 1. The following data are Mathematics scores of students grouped according to type of high school th...

A: Since you have posted a question with multiple subparts, we will solve first three subparts for you....

Q: On a popular app, users rate hair salons as 1, 2, 3, 4, or 5 stars. Suppose a rating is randomly sel...

A:

Q: The golf scores for a school team were normally distributed with a mean of 74 and a standard deviati...

A: According to the given information, we have Mean = 74 Standard deviation = 3

Q: a ra variable A föllowing distributie has nean lue of 0.0, Ilnd -101 2 | 3 P(X=x) 0.2 0.1 0.2 m ) th...

A: We have given that  Mean =0.6 E(x)= ∑x×p(x) E(x2)=∑x2×p(x) Var(x)=E(x2) - [E(x)]2 NOTE:- According t...

Q: The mean age of a combined group of men and women is 30 years. If the mean age of the group of men i...

A:

Q: 14. In the frequency distribution of 100 families given below the number of families corresponding t...

A: Given Information: Total number of families is 100 Median is 50. Required: To find the missing frequ...

Q: A random sample of size 45 taken from a population of 9000 with u = 18.25 and o? = 81

A:

Q: All about Normal Distribution The magazine mass marketing company has received 10 entries in its lat...

A:

Q: You are given the sample mean and the population standard deviation. Use this information convenient...

A:

Q: You are testing the claim that the mean GPA of night students is different from the mean GPA of day ...

A:

Q: O Points: 0 of 1 Save The height of women ages 20-29 is nomally distributed, with a mean of 64.5 inc...

A:

Q: The proportion of men taller than 72.5 inches is _____

A: Given, Mean μ = 68 Std deviation, σ = 1.5 x = 72.5

Q: the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the ...

A: We have given that  Sample size n =35  Sample mean =110 Population standard deviation =19.20  

Q: The height of wonen ages 20-29 is normally distributed, with a mean of 64.5 inches. Assume a=2.8 inc...

A:

Q: Would you pay $10 per throw of two dice if you were to receive a number of dollars equal to the prod...

A: Possible number of outcomes when rolling two dice are (1,1)(1,2)(1,3)(1,4)(1,5)(1,6)(2,1)(2,2)(2,3)(...

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The compan...

A: Formula : Test statistic